Textile-Based Wireless Pressure Sensor Array for Human-Interactive Sensing
Baoqing Nie1, Rong Huang1, Ting Yao1, Yiqiu Zhang2, Yihui Miao1, Changrong Liu1, Jian Liu,*2 and Xinjian Chen*1,3
1School of Electronic and Information Engineering Soochow University Suzhou, Jiangsu 215006, China;
2Institute of Functional Nano and Soft Materials Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Soochow University Suzhou, Jiangsu 215123, China;
3State Key Laboratory of Radiation Medicine and Protection Soochow University Suzhou, Jiangsu 215123, China
A textile-based wireless pressure sensor array (WiPSA) is proposed for ﬂexible remote tactile sensing applications. The WiPSA device is composed of a fabric spacer sandwiched by two separate layers of passive antennas and ferrite flm units. Under the external pressure, the mechanical compression of the ﬂexible fabric spacer leads to an inductance change, which can further be transduced to a detectable shift of the resonant frequency. Importantly, WiPSA integrates the ferrite flm featuring an ultrahigh permeability, which effectively improves the device sensitivity and avoids the interference of conductive materials simultaneously. The device performance with a high quality factor (>35) and sensitivity (−0.19 MHz kPa−1) within a pressure range of 0–20 kPa is demonstrated. In addition, WiPSA achieves excellent reproducibility under periodical pressures (>20 000 cycles), temperature ﬂuctuations (15–103 °C), and humidity variations (40–99%). As a proof of concept for human-interactive sensing, WiPSA is successfully 1) integrated with a ﬂexible wrist band for fngertip pressure-guided direction choices, 2) developed into a smart wireless insole to map the plantar stress distributions, and 3) embedded into a waist-supporting belt to resolve the contact pressure between the belt and human abdomen in a remote transmitting scheme.